Bump error_prone_annotations from 2.5.1 to 2.6.0

Bumps [error_prone_annotations](https://github.com/google/error-prone) from 2.5.1 to 2.6.0.
- [Release notes](https://github.com/google/error-prone/releases)
- [Commits](google/error-prone@v2.5.1...v2.6.0)

Signed-off-by: dependabot[bot] <support@github.com>

pom.xml

@@ -89,7 +89,7 @@
     <jacoco-maven-plugin.version>0.8.6</jacoco-maven-plugin.version>
     <maven-pitest-plugin.version>1.6.4</maven-pitest-plugin.version>
     <pitest-junit5-plugin.version>0.14</pitest-junit5-plugin.version>
-    <error-prone.version>2.5.1</error-prone.version>
+    <error-prone.version>2.6.0</error-prone.version>
     <nullaway.version>0.9.0</nullaway.version>
     <revapi-maven-plugin.version>0.13.6</revapi-maven-plugin.version>
     <revapi-java.version>0.23.2</revapi-java.version>